<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>WebSocket 时间服务器</title>
</head>
<body>

<script type="text/javascript">
    var socket;
    if(!window.WebSocket){
        window.WebSocket = window.MozWebSocket;
    }

    if(window.WebSocket){
        socket = new WebSocket("ws://localhost:8080/websocket");
        socket.onmessage = function(event){
            var ta = document.getElementById('responseText');
            ta.value = "";
            ta.value = event.data;
        };

        socket.onopen = function(event){
            var ta = document.getElementById('responseText');
            ta.value = "打开websocket服务正常, 浏览器支持websocket!";
        };

        socket.onclose = function(event){
            var ta = document.getElementById('responseText');
            ta.value = "";
            ta.value = "websocket 关闭!";
        };
    }else{
        alert("抱歉, 您的浏览器不支持websocket协议!");
    }

    function send(message){
        if(!window.WebSocket){
            return;
        }

        if(socket.readyState == WebSocket.OPEN){
            socket.send(message);
        }else{
            alert("websocket连接没有建立成功!");
        }
    }
</script>

<form onsubmit="return false;">
    <input type="text" name="message" value="netty 最佳实践"/>
    <br/>
    <br/>
    <input type="button" value="发送" onclick="send(this.form.message.value)">
    <hr color="blue"/>
    <h3>服务端返回的应答消息</h3>
    <textarea id="responseText" style="width:500px; height: 300px;">

    </textarea>
</form>
</body>
</html>